Investigation of Sub-surface Geology through Integrated Approach of Geological and Geophysical Studies in the Part of South-eastern Maharashtra, India

摘要

Groundwater study is carried out in the Parbhani district using the field and geophysical investigations in order to understand the sub-surface geology and groundwater potential of the area. The area under investigation is characterised by the presence of basaltic lava flows of nearly horizontal nature. The basalt flows are classified in to two broad categories i.e. vesicular-amygdaloidal (compound pahoehoe type) flow and compact basalt (aa type) simple flow depending on their geomorphic expression and nature of the flow. In the present study an attempt is made to explore the groundwater bearing formations through the well inventory data of 147 wells from 15 different locatins and the geophysical exploration using the Schlumberger vertical electrical resistivity sounding at 12 different locations with AB/2 105 m and MN/2 10 to 15 m using inverse slope method. The hydrogeological interpretation based on resistivity models reveal the water horizons trap within the weathered/fractured basalt flows. The results of the resistivity models decipher potential aquifer lying between 30 m and 40 m depth, nevertheless, it corroborates with the static water level measurements in the area of study.